OK, PK, I have a question for you. Have you ever believed that a character in any book which you have ever read becomes so well studied and "known" (or understood) by you that you could almost read their mind? Granted, Who has known the mind of God? Yet we have the mind of Christ, according to the Apostle Paul. Was Paul fooling himself? Or can we question whether the words which I loosely quote were even attributable to Saul/Paul?
This one is as hard to falsify as it is to verify. And once a skeptic has raised the question of authorship to a level beyond a reasonable doubt, it becomes hard to actually know any character in the Bible. The book becomes a ragtag collection of random and unknown authors. Satan has done his job well. Comprende? Perhaps to a skeptic, doubt is a badge of honor. Certainly not so for a believer.